Increase logging in concurrent relocation test

This commit increases the logging level on the index and relocate
concurrently test to obtain some insight into the global checkpoint
moving backwards.

core/src/test/java/org/elasticsearch/recovery/RelocationIT.java

@@ -449,7 +449,11 @@ public class RelocationIT extends ESIntegTestCase {
         }
     }
 
-    @TestLogging("org.elasticsearch.action.bulk:TRACE,org.elasticsearch.action.search:TRACE")
+    @TestLogging(
+            "org.elasticsearch.action.bulk:TRACE,"
+                    + "org.elasticsearch.action.search:TRACE,"
+                    + "org.elasticsearch.cluster.service:TRACE,"
+                    + "org.elasticsearch.index.seqno:TRACE")
     public void testIndexAndRelocateConcurrently() throws ExecutionException, InterruptedException {
         int halfNodes = randomIntBetween(1, 3);
         Settings[] nodeSettings = Stream.concat(